When I did my Latihan Ikhtisas, I was struggling to find materials for my class. Teaching university students does not require worksheets for weekly discussion. But for secondary students, you need to use worksheet for activity, most of the time. This is to save time for them to copy what you write from the white board. 😀
There are several websites for teachers by teachers which provide materials that teachers can use in their teaching like posters, handouts, worksheets and such for free (as long as you use it for teaching and not making any profit). Some of the websites require you to register. But others are not. Some of the websites are such as
To know more, you can go to this website which listed around 50 useful websites for teachers to find teaching materials, tips and ideas for their classroom activity.
https://teach4theheart.com/50-best-websites-for-teachers/